/*
 *  Copyright 2015 The WebRTC project authors. All Rights Reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the LICENSE file in the root of the source
 *  tree. An additional intellectual property rights grant can be found
 *  in the file PATENTS.  All contributing project authors may
 *  be found in the AUTHORS file in the root of the source tree.
 */

package org.webrtc;

import android.os.SystemClock;
import java.util.ArrayList;
import java.util.List;
import org.webrtc.CameraEnumerationAndroid.CaptureFormat;

@SuppressWarnings("deprecation")
public class Camera1Enumerator implements CameraEnumerator {
	private final static String TAG = "Camera1Enumerator";
	// Each entry contains the supported formats for corresponding camera index. The formats for all
	// cameras are enumerated on the first call to getSupportedFormats(), and cached for future
	// reference.
	private static List<List<CaptureFormat>> cachedSupportedFormats;

	private final boolean captureToTexture;

	public Camera1Enumerator() {
		this(true /* captureToTexture */);
	}

	public Camera1Enumerator(boolean captureToTexture) {
		this.captureToTexture = captureToTexture;
	}

	// Returns device names that can be used to create a new VideoCapturerAndroid.
	@Override
	public String[] getDeviceNames() {
		ArrayList<String> namesList = new ArrayList<>();
		for (int i = 0; i < android.hardware.Camera.getNumberOfCameras(); ++i) {
			String name = getDeviceName(i);
			if (name != null) {
				namesList.add(name);
				Logging.d(TAG, "Index: " + i + ". " + name);
			} else {
				Logging.e(TAG, "Index: " + i + ". Failed to query camera name.");
			}
		}
		String[] namesArray = new String[namesList.size()];
		return namesList.toArray(namesArray);
	}

	@Override
	public boolean isFrontFacing(String deviceName) {
		android.hardware.Camera.CameraInfo info = getCameraInfo(getCameraIndex(deviceName));
		return info != null && info.facing == android.hardware.Camera.CameraInfo.CAMERA_FACING_FRONT;
	}

	@Override
	public boolean isBackFacing(String deviceName) {
		android.hardware.Camera.CameraInfo info = getCameraInfo(getCameraIndex(deviceName));
		return info != null && info.facing == android.hardware.Camera.CameraInfo.CAMERA_FACING_BACK;
	}

	@Override
	public List<CaptureFormat> getSupportedFormats(String deviceName) {
		return getSupportedFormats(getCameraIndex(deviceName));
	}

	@Override
	public CameraVideoCapturer createCapturer(
			String deviceName, CameraVideoCapturer.CameraEventsHandler eventsHandler) {
		return new Camera1Capturer(deviceName, eventsHandler, captureToTexture);
	}

	private static android.hardware.Camera.CameraInfo getCameraInfo(int index) {
		android.hardware.Camera.CameraInfo info = new android.hardware.Camera.CameraInfo();
		try {
			android.hardware.Camera.getCameraInfo(index, info);
		} catch (Exception e) {
			Logging.e(TAG, "getCameraInfo failed on index " + index, e);
			return null;
		}
		return info;
	}

	static synchronized List<CaptureFormat> getSupportedFormats(int cameraId) {
		if (cachedSupportedFormats == null) {
			cachedSupportedFormats = new ArrayList<List<CaptureFormat>>();
			for (int i = 0; i < android.hardware.Camera.getNumberOfCameras(); ++i) {
				cachedSupportedFormats.add(enumerateFormats(i));
			}
		}
		return cachedSupportedFormats.get(cameraId);
	}

	private static List<CaptureFormat> enumerateFormats(int cameraId) {
		Logging.d(TAG, "Get supported formats for camera index " + cameraId + ".");
		final long startTimeMs = SystemClock.elapsedRealtime();
		final android.hardware.Camera.Parameters parameters;
		android.hardware.Camera camera = null;
		try {
			Logging.d(TAG, "Opening camera with index " + cameraId);
			camera = android.hardware.Camera.open(cameraId);
			parameters = camera.getParameters();
		} catch (RuntimeException e) {
			Logging.e(TAG, "Open camera failed on camera index " + cameraId, e);
			return new ArrayList<CaptureFormat>();
		} finally {
			if (camera != null) {
				camera.release();
			}
		}

		final List<CaptureFormat> formatList = new ArrayList<CaptureFormat>();
		try {
			int minFps = 0;
			int maxFps = 0;
			final List<int[]> listFpsRange = parameters.getSupportedPreviewFpsRange();
			if (listFpsRange != null) {
				// getSupportedPreviewFpsRange() returns a sorted list. Take the fps range
				// corresponding to the highest fps.
				final int[] range = listFpsRange.get(listFpsRange.size() - 1);
				minFps = range[android.hardware.Camera.Parameters.PREVIEW_FPS_MIN_INDEX];
				maxFps = range[android.hardware.Camera.Parameters.PREVIEW_FPS_MAX_INDEX];
			}
			for (android.hardware.Camera.Size size : parameters.getSupportedPreviewSizes()) {
				formatList.add(new CaptureFormat(size.width, size.height, minFps, maxFps));
			}
		} catch (Exception e) {
			Logging.e(TAG, "getSupportedFormats() failed on camera index " + cameraId, e);
		}

		final long endTimeMs = SystemClock.elapsedRealtime();
		Logging.d(TAG, "Get supported formats for camera index " + cameraId + " done."
				+ " Time spent: " + (endTimeMs - startTimeMs) + " ms.");
		return formatList;
	}

	// Convert from android.hardware.Camera.Size to Size.
	static List<Size> convertSizes(List<android.hardware.Camera.Size> cameraSizes) {
		final List<Size> sizes = new ArrayList<Size>();
		for (android.hardware.Camera.Size size : cameraSizes) {
			sizes.add(new Size(size.width, size.height));
		}
		return sizes;
	}

	// Convert from int[2] to CaptureFormat.FramerateRange.
	static List<CaptureFormat.FramerateRange> convertFramerates(List<int[]> arrayRanges) {
		final List<CaptureFormat.FramerateRange> ranges = new ArrayList<CaptureFormat.FramerateRange>();
		for (int[] range : arrayRanges) {
			ranges.add(new CaptureFormat.FramerateRange(
					range[android.hardware.Camera.Parameters.PREVIEW_FPS_MIN_INDEX],
					range[android.hardware.Camera.Parameters.PREVIEW_FPS_MAX_INDEX]));
		}
		return ranges;
	}

	// Returns the camera index for camera with name |deviceName|, or throws IllegalArgumentException
	// if no such camera can be found.
	static int getCameraIndex(String deviceName) {
		Logging.d(TAG, "getCameraIndex: " + deviceName);
		for (int i = 0; i < android.hardware.Camera.getNumberOfCameras(); ++i) {
			if (deviceName.equals(getDeviceName(i))) {
				return i;
			}
		}
		throw new IllegalArgumentException("No such camera: " + deviceName);
	}

	// Returns the name of the camera with camera index. Returns null if the
	// camera can not be used.
	static String getDeviceName(int index) {
		android.hardware.Camera.CameraInfo info = getCameraInfo(index);
		if (info == null) {
			return null;
		}

		String facing =
				(info.facing == android.hardware.Camera.CameraInfo.CAMERA_FACING_FRONT) ? "front" : "back";
		return "Camera " + index + ", Facing " + facing + ", Orientation " + info.orientation;
	}
}
